[wp-trac] [WordPress Trac] #64836: Media: skip server image support check when not generating sub-sizes

[WordPress Trac]

#64836: Media: skip server image support check when not generating sub-sizes
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 Reporter:  adamsilverstein  |      Owner:  adamsilverstein
     Type:  defect (bug)     |     Status:  assigned
 Priority:  normal           |  Milestone:  7.0
Component:  Media            |    Version:  trunk
 Severity:  normal           |   Keywords:  has-patch
  Focuses:                   |
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 ## Summary

 REST API: Skip server-side image editor support check when
 `generate_sub_sizes` is `false`

 ## Description

 When uploading images via the REST API with `generate_sub_sizes` set to
 `false`, the server still checks whether the image editor supports the
 uploaded image format. This causes uploads of formats like AVIF to fail
 with `rest_upload_image_type_not_supported`, even though the client is
 handling all image processing and the server doesn't need to generate any
 sub-sizes.

 The `generate_sub_sizes` parameter was introduced to allow clients (such
 as the block editor with client-side media processing) to handle image
 resizing themselves. When this parameter is `false`, the server-side image
 editor support check is unnecessary and should be skipped.

 ### Steps to Reproduce

 1. Enable client-side media processing in the block editor (or use the
 REST API directly with `generate_sub_sizes=false`)
 2. Attempt to upload an AVIF image on a server where the image editor does
 not support AVIF
 3. The upload fails with `rest_upload_image_type_not_supported`

 ### Expected Result

 The upload should succeed because the client is handling all image
 processing.

 ### Actual Result

 The upload fails with a 400 error: "The web server cannot generate
 responsive image sizes for this image."

 ## Proposed Fix

 In `WP_REST_Attachments_Controller::create_item_permissions_check()`,
 after the `wp_prevent_unsupported_mime_type_uploads` filter is applied,
 check if `generate_sub_sizes` is explicitly set to `false`. If so, set
 `$prevent_unsupported_uploads` to `false` to bypass the server-side image
 editor support check.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64836>
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